硅酸盐学报

电晕极化对钛酸钡粉体压电光催化性能的影响

PDF下载

杨伟雪 ¹ , 卢袁真子 ² , 王宝苑 ¹ , 王炳博 ¹ , 王梓鉴 ² , 侯莹 ¹

硅酸盐学报 | 研究论文 2024,52(9): 2889-2899

收起

硅酸盐学报 |研究论文 2024 , 52 (9) : 2889 -2899

电晕极化对钛酸钡粉体压电光催化性能的影响

全屏

杨伟雪¹, 卢袁真子², 王宝苑¹, 王炳博¹, 王梓鉴², 侯莹¹

作者信息

^1．华东理工大学物理学院，上海 200237

^2．中国科学技术大学物理学院，合肥 230026

通讯作者:

侯莹（1984—），女，博士，教授。

作者简介:

杨伟雪（2000—），女，硕士研究生。

Effect of Corona Poling on Piezo-Photocatalytic Performance of Barium Titanate Powders

Weixue YANG¹, Yuanzhenzi LU², Baoyuan WANG¹, Bingbo WANG¹, Zijian WANG², Ying HOU¹

Affiliations

^1.School of Physics, East China University of Science and Technology, Shanghai 200237, China

^2.Department of Physics, University of Science and Technology of China, Hefei 230026, China

Corresponding Author:

HOU Ying (1984-), female, Ph.D., Professor. E-mail: houying@ecust.edu.cn

YANG Weixue (2000-), female, Master candidate. E-mail: ywx001217@126.com

出版时间: 2024-09-20 doi: 10.14062/j.issn.0454-5648.20240118

文章导航

摘要

收起

采用溶胶-胶法制备钛酸钡（BaTiO₃, BT）粉体，通过改变保温时间（2、5、12 h）获得了不粒径尺寸的BT纳米颗粒。将BT纳米粉体在6.56 kV电压下分别进行1 h电晕极化，探究极化前后晶格的畸变程度以及粉体的压电光催化性能。结果表明：随保温时间延长，颗粒粒径尺寸增大，极化后晶体的晶格畸变程度增强，四方度提高。同时，极化使得3组粉体对染料的降解速率大幅提升，动力学速率常数分别为极化前的4.94、2.21、1.62倍，与晶格畸变程度呈现相同规律。其中，保温2 h的粉体电晕极化后对有机染料罗丹明B（RhB）的降解率在180 min内达到96.81%，具有最优的压电光催化性能，这为电晕极化在粉体催化领域的应用提供了实验参考。

关键词

钛酸钡 / 压电光催化 / 电晕极化 / 罗丹明B

Abstract

收起

Introduction

Photocatalysis is an effective technology to solve environmental pollution. Ferroelectric ceramics, as a new type of catalyst, have been received widespread attention mainly attributed to the ability to reduce the recombination rate of photo^- induced carriers and to improve catalytic performance by building a built-in electric field. In order to avoid the decrease of remanent polarization in ceramic bulks during the traditional poling technology and simplify the poling process, corona poling technology has been used for the poling of powders. Several researches indicated that corona poling could significantly improve the catalytic performance, while the relationship among the particle size, phase structure, and piezo-photocatalytic performance was still not so clear. Therefore, BaTiO₃ (BT) nanoparticles with different particle sizes were prepared via sol-gel method and then polarized these powders for 1 h under a voltage of 6.56 kV. The phase structures and the lattice distortion before and after poling were carefully explored. In addition, the effect of corona poling on the piezo-photocatalytic performance of BT powders was investigated, Rhodamine B (RhB) was utilized as the target pollutant.

Methods

Barium acetate (C₄H₆O₄Ba) and tetrabutyl titanate (C₁₆H₃₆O₄Ti) were used as raw materials, both were dissolved in acetic acid and ethanol, respectively. Subsequently, these two solutions were mixed and then stirred for 3 h, after that, the solution was left to stand for 16 h, and then dried in an oven at 70 ℃ for 24 h. The mixtures were calcined at 800 ℃ for 2, 5 h and 12 h, respectively, in order to obtain BT powders with different particle sizes (the corresponding BT powders were respectively referred to as 2, 5 h and 12 h).

A SmartLab type X-ray diffractometer (XRD) was used to analyze the crystal structure of the obtained powders. The obtained powders were measured using an Invia Reflex model laser micro Raman spectrometer (Raman). In addition, the Helios G4 UC type scanning electron microscopy (SEM) was used to observe the surface morphology of the obtained powders. A Mapada UV-6300 UV-Vis spectrophotometer (UV-Vis) was used to characterize the transmittance of the obtained powders, thereby evaluating the degradation rate of powders. A home-made corona poling set-up at 6.56 kV for 1 h was used to polarize the BT powders. The unpoled/poled BT powders were mixed in RhB and stirred for 30 min to complete the dark adsorption. A Xe lamp (300 W) was used to simulate the sunlight irradiation, and an ultrasonic machine (30 kHz, 100 W) was used to assist in completing the piezo-photocatalytic test.

Results and discussion

Particle sizes of the 2, 5 h and 12 h BT powders were 55, 110 nm, and 130 nm, respectively. XRD patterns showed that the cubic and tetragonal phases coexisted for all kinds of samples, and Raman spectroscopy confirmed the presence of tetragonal phases. The c/a values of tetragonal phase (c_T/a_T) in these BT powders, evaluated by Rietveld refinement analysis, were 1.007 85 (2 h-unpoled), 1.008 00 (5 h-unpoled), and 1.009 10 (12 h-unpoled), respectively, these were closely related to the particle size. The larger size corresponded to the higher c_T/a_T, illustrating that the ratio of the tetragonal phase would be increased in 12 h BT nanoparticles. After corona poling process, the lattice distortion further strengthened and the c_T/a_T values were 1.008 89 (2 h-poled), 1.008 44 (5 h-poled), and 1.009 32 (12 h-poled), respectively. The difference of c_T/a_T between unpoled and poled BT powders (Δ(c_T/a_T)) was significantly decreased with the increase of particle size, demonstrating the higher poling effectiveness in nanoparticles with smaller size.

Moreover, effect of poling on the piezo-photocatalytic performance of samples was evaluated via observing the degradation of RhB. It was found that the piezocatalysis existed a "bottleneck period", being related to the pressure pulse generated by cavitation bubbles and the free charges generated by particles through surface friction. The reaction rate constants k for unpoled BT powders were 0.003 28 min^-1 (2 h-unpoled), 0.004 39 min^-1 (5 h-unpoled), and 0.003 82 min^-1 (12 h-unpoled), respectively. After poling, the k values were 0.016 20 min^-1 (2 h-poled), 0.009 69 min^-1 (5 h-poled), and 0.006 20 min^-1 (12 h-poled), 4.94, 2.21 and 1.62 times higher than before poling, respectively, mainly attributed to the enhancement of the built-in electric field caused by corona poling, which could increase the driving force for the separation of photo-induced carriers and prolong the lifetime of carriers. Among them, the 2 h-poled powder exhibited the highest rate constant and a degradation efficiency of 96.81%, as that particle size of 2 h-poled samples was smaller than that of 5 h powders and 12 h powders, resulted in a high degree of lattice distortion and enhanced the tetragonality. Moreover, the small particle size of samples was considered to be favorable for the sufficient contact with RhB. Therefore, highest reaction rate constant and degradation efficiency were achieved for the 2 h-poled sample.

Conclusions

BT powders with different particle sizes were prepared and poled by corona poling technology. Effect of the poling process on the degree of lattice distortion, phase structure, and piezo-photocatalytic performance for degrading RhB of BT powders was systematically investigated. Results indicated that the corona poling could deepen the crystal lattice distortion and increase the tetragonality of BT nanoparticles. In addition, poling process could enhance the built-in electric field, reduce the recombination rate of photo-induced carriers, and significantly improve catalytic performance. The rate constants k of the poled powders were 4.94 times (2 h-poled), 2.21 times (5 h-poled), and 1.62 times (12 h-poled) higher than those of unpoled BT powders. Among all samples without and with poling process, the 2 h-poled BT powder achieved the highest degradation efficiency of 96.81% within 180 min, indicated the optimal piezo-photocatalytic performance. This work could provide a simple and rational method to design ferroelectric materials for achieving the high catalytic performance.

Key words

barium titanate / piezo-photocatalysis / corona poling / Rhodamine B

引用本文

杨伟雪, 卢袁真子, 王宝苑, 王炳博, 王梓鉴, 侯莹. 电晕极化对钛酸钡粉体压电光催化性能的影响. 硅酸盐学报, 2024 , 52 (9) : 2889 -2899 . DOI: 10.14062/j.issn.0454-5648.20240118

Weixue YANG, Yuanzhenzi LU, Baoyuan WANG, Bingbo WANG, Zijian WANG, Ying HOU. Effect of Corona Poling on Piezo-Photocatalytic Performance of Barium Titanate Powders[J]. Journal of the Chinese Ceramic Society, 2024 , 52 (9) : 2889 -2899 . DOI: 10.14062/j.issn.0454-5648.20240118

基金

收起

国家自然科学基金(52272109)

参考文献

收起

文献

收起

参考文献引证文献

排序方式：

2024年第52卷第9期

PDF下载

引用本文

BibTeX

文章信息

doi: 10.14062/j.issn.0454-5648.20240118

接收时间：2024-02-06
首发时间：2026-10-22
出版时间：2024-09-20

补充材料

相关文章

文章信息

作者

出版历史

收稿日期：2024-02-06
修回日期：2024-03-01

基金

国家自然科学基金(52272109)

作者信息

^1．华东理工大学物理学院，上海 200237

^2．中国科学技术大学物理学院，合肥 230026

通讯作者:

侯莹（1984—），女，博士，教授。

参考文献

分享链接

https://castjournals.cast.org.cn/joweb/gsyxb/CN/10.14062/j.issn.0454-5648.20240118

分享至

全文二维码

扫描看全文

引用本文

BibTeX

本文的引用情况

2种不同金属材料的力学参数

科 Family	属数 Number of genus	种数 Number of species	占总种数比例 Percentage of total species (%)	属 Genus	种数 Number of species	占总种数比例 Percentage of total species (%)
鹅膏菌科Amanitaceae	2	11	5.26	鹅膏菌属 Amanita	10	4.78
小菇科 Mycenaceae	2	12	5.74	丝盖伞属 Inocybe	5	2.39
多孔菌科 Polyporaceae	8	14	6.70	蜡蘑属 Laccaria	5	2.39
红菇科 Russulaceae	3	23	11.00	小皮伞属 Marasmius	6	2.87
				小菇属 Mycena	11	5.26
				光柄菇属 Pluteus	5	2.39
				红菇属 Russula	17	8.13
				栓菌属 Trametes	5	2.39

关闭全屏

BibTeX
EndNote
RefWorks
TxT